. . "\u201CByzantine\u201D-Bulgarian battle of Versinikia" . "Bulgaria" . . "battle of Versinikia" . "Byzantine\u201D-Bulgarian battle of Versinikia" . "Battle of Versinikia" . "Bulgarian Empire" . "20-30,000" . . . "at Versinikia" . "First Bulgarian Empire" . "defeated" . . "Unknown" . . . . "Battle of Versinicia" . . "attacked" . "0813-06-22" . . . "Battle of Versinikia" . "Versinikia, Battle of" . . . . . "invasion" . "Byzantine Empire" . . . . . "Versinikia" . . . . . . "Bulgarian victory" . "Byzantines are heavily defeated by the Bulgars at Versinikia" . . "6,000\u20137,000 or 12,000" . "Siege of Mesembria" . "campaigned" . .